From the December 2010 Annual of Supergirl, in which Supergirl goes to the 30th century to meet the Legion Of Superheroes and spend some time with them. While she does, she relaxes with the female members of the Legion by the pool:
And last bu not least, some pictures of her in a native costume from a 1969 issue (Action Comics #372) as she (in her Linda Davners phase) is filming a movie dressed in a costume that looks like a Polynesian version of the Supergirl costume: